1899) 400,000,000 (Geikie, 1899) 400,000,000 (Geikie, 1899) 400,000,000 (Geikie, 1899) 400,000,000 (Geikie, 1899) 400,000,000 (Geikie, 1899) I 200,000,000 I,400,000,000 tion is to be interpreted as likely to bring into communication with Australia, the Northern